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Finding the Third Proportional to 8,431 and 12,763

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Solution

The third proportional to 8,431 and 12,763 is: 19,320.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,431 : 12,763 = 12,763 : x
  2. Step 2: Convert to fraction form
    8,431/12,763 = 12,763/x
  3. Step 3: Cross multiply
    8,431x = 12,763 × 12,763
  4. Step 4: Simplify right side
    8,431x = 162,894,169
  5. Step 5: Solve for x
    x = 162,894,169/8,431
  6. Step 6: Final answer
    x = 19,320.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.